无法安装rails 3.2.9:无法构建gem native扩展

Question

我刚刚清理了 rvm和ruby并重新安装了它.我正在尝试安装rails但是我收到此错误:

gem install rails -v 3.2.9

Building native extensions.  This could take a while...
ERROR:  Error installing rails:
    ERROR: Failed to build gem native extension.

        /usr/bin/ruby1.9.1 extconf.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError)
    from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from extconf.rb:1:in `<main>'


Gem files will remain installed in /var/lib/gems/1.9.1/gems/json-1.8.1 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/json-1.8.1/ext/json/ext/generator/gem_make.out

如果我bundle install用我的Gemfile那个rails 3.2.9 和更多的宝石运行我得到这个错误:

An error occurred while installing json (1.8.1), and Bundler cannot continue.
Make sure that `gem install json -v '1.8.1'` succeeds before bundling.

你猜怎么着.运行建议的命令给我另一个错误:

Building native extensions.  This could take a while...
ERROR:  Error installing json:
    ERROR: Failed to build gem native extension.

        /usr/bin/ruby1.9.1 extconf.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError)
    from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from extconf.rb:1:in `<main>'


Gem files will remain installed in /var/lib/gems/1.9.1/gems/json-1.8.1 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/json-1.8.1/ext/json/ext/generator/gem_make.out

Answer 1

可能重复:

• 无法安装gem - 无法构建gem native扩展 - 无法加载此类文件 - mkmf(LoadError)
• `require':没有要加载的文件 - mkmf(LoadError)

根据您的ruby版本,运行:

sudo apt-get install ruby1.9.1-dev